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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
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    <title>css基本语法</title>
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<body>
        <h1>This is <strong>very</strong> <strong>very</strong> important.</h1>
        <h1>This is <em>really <strong>very</strong></em> important.</h1>

        <ul class = "food">
            <li>水果
                <ul>
                    <li>香蕉</li>
                    <li>苹果</li>
                    <li>菠萝</li>
                </ul>
            </li>
            <li>蔬菜
                <ul>
                    <li>白菜</li>
                    <li>萝卜</li>
                    <li>菠菜</li>
                </ul>
            </li>
        </ul>
</body>
</html>